Class

# iOSMobileUserControl

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## Description

Used to embed UIViews created via declares into the Xojo control hierarchy.

## Properties

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| Name                                                          | Type                                                          | Read-Only | Shared |
|---------------------------------------------------------------|---------------------------------------------------------------|-----------|--------|
| `AccessibilityHint<iosmobileusercontrol.accessibilityhint>`   | `String</api/data_types/string>`                              |           |        |
| `AccessibilityLabel<iosmobileusercontrol.accessibilitylabel>` | `String</api/data_types/string>`                              |           |        |
| `ControlCount<iosmobileusercontrol.controlcount>`             | `Integer</api/data_types/integer>`                            | ✓         |        |
| `Enabled<iosmobileusercontrol.enabled>`                       | `Boolean</api/data_types/boolean>`                            |           |        |
| `Height<iosmobileusercontrol.height>`                         | `Integer</api/data_types/integer>`                            | ✓         |        |
| `Left<iosmobileusercontrol.left>`                             | `Integer</api/data_types/integer>`                            | ✓         |        |
| `Name<iosmobileusercontrol.name>`                             | `String</api/data_types/string>`                              | ✓         |        |
| `Parent<iosmobileusercontrol.parent>`                         | `MobileUIControl</api/user_interface/mobile/mobileuicontrol>` | ✓         |        |
| `TintColor<iosmobileusercontrol.tintcolor>`                   | `ColorGroup</api/graphics/colorgroup>`                        |           |        |
| `Top<iosmobileusercontrol.top>`                               | `Integer</api/data_types/integer>`                            | ✓         |        |
| `Visible<iosmobileusercontrol.visible>`                       | `Boolean</api/data_types/boolean>`                            |           |        |
| `Width<iosmobileusercontrol.width>`                           | `Integer</api/data_types/integer>`                            | ✓         |        |

## Methods

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| Name                                                      | Parameters                                                                                                                                                | Returns                                                       | Shared |
|-----------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------|--------|
| `AddConstraint<iosmobileusercontrol.addconstraint>`       | constraint As `iOSLayoutConstraint</api/ios/ioslayoutconstraint>`, name As `String</api/data_types/string>` = ""                                          |                                                               |        |
| `AddControl<iosmobileusercontrol.addcontrol>`             | child As `MobileUIControl</api/user_interface/mobile/mobileuicontrol>`, isBeingAdded As `Boolean</api/data_types/boolean>` = `False</api/language/false>` |                                                               |        |
| `ClearFocus<iosmobileusercontrol.clearfocus>`             |                                                                                                                                                           |                                                               |        |
| `Constraint<iosmobileusercontrol.constraint>`             | name As `String</api/data_types/string>`                                                                                                                  | `iOSLayoutConstraint</api/ios/ioslayoutconstraint>`           |        |
| `ControlAt<iosmobileusercontrol.controlat>`               | index As `Integer</api/data_types/integer>`                                                                                                               | `MobileUIControl</api/user_interface/mobile/mobileuicontrol>` |        |
| `Controls<iosmobileusercontrol.controls>`                 |                                                                                                                                                           | `Iterable</api/language/iterable>`                            |        |
| `Handle<iosmobileusercontrol.handle>`                     |                                                                                                                                                           | `Ptr</api/data_types/additional_types/ptr>`                   |        |
| `Refresh<iosmobileusercontrol.refresh>`                   |                                                                                                                                                           |                                                               |        |
| `RemoveConstraint<iosmobileusercontrol.removeconstraint>` | constraint As `iOSLayoutConstraint</api/ios/ioslayoutconstraint>`                                                                                         |                                                               |        |
|                                                           | name As `String</api/data_types/string>`                                                                                                                  |                                                               |        |
| `RemoveControl<iosmobileusercontrol.removecontrol>`       | child As `MobileUIControl</api/user_interface/mobile/mobileuicontrol>`                                                                                    |                                                               |        |
| `SetFocus<iosmobileusercontrol.setfocus>`                 |                                                                                                                                                           |                                                               |        |

## Events

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| Name                                                                        | Parameters                                 | Returns                                     |
|-----------------------------------------------------------------------------|--------------------------------------------|---------------------------------------------|
| `AppearanceChanged<iosmobileusercontrol.appearancechanged>`                 | dark As `Boolean</api/data_types/boolean>` |                                             |
| `Closing<iosmobileusercontrol.closing>`                                     |                                            |                                             |
| `CreateView<iosmobileusercontrol.createview>`                               |                                            | `Ptr</api/data_types/additional_types/ptr>` |
| `DrawControlInLayoutEditor<iosmobileusercontrol.drawcontrolinlayouteditor>` | g As `Graphics</api/graphics/graphics>`    |                                             |
| `Opening<iosmobileusercontrol.opening>`                                     |                                            |                                             |

## Constants

> These constants are designed to be used with the <span class="title-ref">MobileUIControl</span> to show icons at the Navigator and Library.
>
> | Name          | Description                                                                                                                                                             |
> |---------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
> | NavigatorIcon | This constant is used to override the icon of your control in the Navigator. Using the WebSDKIconConverter, place the Base64 icon data into the value of this constant. |
> | LibraryIcon   | This constant is used to override the icon of your control in the Library. Using the WebSDKIconConverter, place the Base64 icon data into the value of this constant.   |

## Property descriptions

<div id="iosmobileusercontrol.accessibilityhint">

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iOSMobileUserControl.AccessibilityHint

**AccessibilityHint** As `String</api/data_types/string>`

> The accessibility hint is a longer description that is read aloud when VoiceOver is enabled.
>
> ``` xojo
> Me.AccessibilityHint = "Click to calculate the value and display the next screen."
> ```

<div id="iosmobileusercontrol.accessibilitylabel">

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iOSMobileUserControl.AccessibilityLabel

**AccessibilityLabel** As `String</api/data_types/string>`

> The accessibility label of of a control is a short name that is read aloud when VoiceOver is enabled.
>
> ``` xojo
> Me.AccessibilityLabel = "Calculate the value."
> ```

<div id="iosmobileusercontrol.controlcount">

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iOSMobileUserControl.ControlCount

**ControlCount** As `Integer</api/data_types/integer>`

> The number of child controls in the control.
>
> This property is read-only.

<div id="iosmobileusercontrol.enabled">

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iOSMobileUserControl.Enabled

**Enabled** As `Boolean</api/data_types/boolean>`

> Indicates whether the control is enabled or disabled.
>
> Disable the button:
>
> ``` xojo
> Button1.Enabled = False
> ```

<div id="iosmobileusercontrol.height">

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iOSMobileUserControl.Height

**Height** As `Integer</api/data_types/integer>`

> The height of the control.
>
> This property is read-only.

<div id="iosmobileusercontrol.left">

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iOSMobileUserControl.Left

**Left** As `Integer</api/data_types/integer>`

> The left position of the control.
>
> This property is read-only.

<div id="iosmobileusercontrol.name">

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iOSMobileUserControl.Name

**Name** As `String</api/data_types/string>`

> The name of the control.
>
> This property is read-only.

<div id="iosmobileusercontrol.parent">

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iOSMobileUserControl.Parent

**Parent** As `MobileUIControl</api/user_interface/mobile/mobileuicontrol>`

> The parent (sometimes called a "Super") class of the control.
>
> This property is read-only.

<div id="iosmobileusercontrol.tintcolor">

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iOSMobileUserControl.TintColor

**TintColor** As `ColorGroup</api/graphics/colorgroup>`

> Changes a control's tint color.
>
> On iOS, the following controls support TintColor:
>
> | Enum        | Description                                                                  |
> |-------------|------------------------------------------------------------------------------|
> | ProgressBar | The area indicating the value of the control will be drawn in the TintColor. |
> | Slider      | The area indicating the value of the control will be drawn in the TintColor. |
> | TextArea    | The cursor and text highlight color will be drawn in the TintColor.          |
> | TextField   | The cursor and text highlight color will be drawn in the TintColor.          |

<div id="iosmobileusercontrol.top">

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iOSMobileUserControl.Top

**Top** As `Integer</api/data_types/integer>`

> The top position of the control.
>
> This property is read-only.

<div id="iosmobileusercontrol.visible">

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iOSMobileUserControl.Visible

**Visible** As `Boolean</api/data_types/boolean>`

> Indicates whether the control is visible.
>
> Make a button invisible:
>
> ``` xojo
> Button1.Visible = False
> ```

<div id="iosmobileusercontrol.width">

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iOSMobileUserControl.Width

**Width** As `Integer</api/data_types/integer>`

> The width of the control.
>
> This property is read-only.

## Method descriptions

<div id="iosmobileusercontrol.addconstraint">

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iOSMobileUserControl.AddConstraint

**AddConstraint**(constraint As `iOSLayoutConstraint</api/ios/ioslayoutconstraint>`, name As `String</api/data_types/string>` = "")

> Adds a *constraint* to the control. The optional *name* parameter can be used to `remove a constraint<mobileuicontrol.removeconstraint>` that was added via code.
>
> This constraint is used by child controls that have been added to this control.

<div id="iosmobileusercontrol.addcontrol">

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iOSMobileUserControl.AddControl

**AddControl**(child As `MobileUIControl</api/user_interface/mobile/mobileuicontrol>`, isBeingAdded As `Boolean</api/data_types/boolean>` = `False</api/language/false>`)

> Adds a *child* control to the control. When the value of *isBeingAdded* is `True</api/language/true>`, the Opening event is triggered for the child control being added.

<div id="iosmobileusercontrol.clearfocus">

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iOSMobileUserControl.ClearFocus

**ClearFocus**

> Removes the focus from the control.
>
> ``` xojo
> TextField1.ClearFocus
> ```

<div id="iosmobileusercontrol.constraint">

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iOSMobileUserControl.Constraint

**Constraint**(name As `String</api/data_types/string>`) As `iOSLayoutConstraint</api/ios/ioslayoutconstraint>`

> Gets a reference to a named constraint so that you can modify its settings in code.
>
> Change an existing (and named) constraint of a control on the Screen:
>
> ``` xojo
> ' "TAWidth" is a width constraint for a TextField that has been given
> ' a name in the auto-layout Inspector properties.
> Var c As iOSLayoutConstraint = Self.Constraint("TAWidth")
> c.Offset = 200
> ```

<div id="iosmobileusercontrol.controlat">

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iOSMobileUserControl.ControlAt

**ControlAt**(index As `Integer</api/data_types/integer>`) As `MobileUIControl</api/user_interface/mobile/mobileuicontrol>`

> Gets the child control at the specified *index*.

<div id="iosmobileusercontrol.controls">

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iOSMobileUserControl.Controls

**Controls** As `Iterable</api/language/iterable>`

> Allows you to iterate through all the controls that have been added to this control.

<div id="iosmobileusercontrol.handle">

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iOSMobileUserControl.Handle

**Handle** As `Ptr</api/data_types/additional_types/ptr>`

> The handle to the underlying native OS control.

<div id="iosmobileusercontrol.refresh">

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iOSMobileUserControl.Refresh

**Refresh**

> Marks the control so that it will be redrawn during the next event loop.
>
> Call Refresh to force a Canvas to redraw itself:
>
> ``` xojo
> Canvas1.Refresh
> ```

<div id="iosmobileusercontrol.removeconstraint">

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iOSMobileUserControl.RemoveConstraint

**RemoveConstraint**(constraint As `iOSLayoutConstraint</api/ios/ioslayoutconstraint>`)

> Removes a *constraint* from the control.

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**RemoveConstraint**(name As `String</api/data_types/string>`)

> Removes the constraint with the *name* passed from the `Screen</api/user_interface/mobile/mobilescreen>`.

<div id="iosmobileusercontrol.removecontrol">

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iOSMobileUserControl.RemoveControl

**RemoveControl**(child As `MobileUIControl</api/user_interface/mobile/mobileuicontrol>`)

> Removes the control from the control.

<div id="iosmobileusercontrol.setfocus">

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iOSMobileUserControl.SetFocus

**SetFocus**

> Sets the focus to the control.
>
> ``` xojo
> TextField1.SetFocus
> ```

## Event descriptions

<div id="iosmobileusercontrol.appearancechanged">

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iOSMobileUserControl.AppearanceChanged

**AppearanceChanged**(dark As `Boolean</api/data_types/boolean>`)

> Raised when the appearance of the OS changes between light and dark mode.

<div id="iosmobileusercontrol.closing">

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iOSMobileUserControl.Closing

**Closing**

> Called when the control's layout is closing.

<div id="iosmobileusercontrol.createview">

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iOSMobileUserControl.CreateView

**CreateView** As `Ptr</api/data_types/additional_types/ptr>`

> Raised when the control needs you to create your UIView. Return the pointer to the UIView.
>
> See Apple's documentation for more information about [UIView](https://developer.apple.com/documentation/uikit/uiview).

<div id="iosmobileusercontrol.drawcontrolinlayouteditor">

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iOSMobileUserControl.DrawControlInLayoutEditor

**DrawControlInLayoutEditor**(g As `Graphics</api/graphics/graphics>`)

> This event allows you to draw a preview of your control in the Layout Editor, similar to how the control will look like in at runtime. As this code will run as a script in the IDE, if it doesn't compile for any reason, you will see what happened in the Messages pane.
>
> This event fires whenever your control needs to be drawn in the Layout Editor.
>
> There is no need to re-open the project or restart the IDE, in order to see changes you make to the code in this event.
>
> For more information of how this works, see `Drawing Your Control<iosmobileusercontrol.drawing_your_control>`.

<div id="iosmobileusercontrol.opening">

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iOSMobileUserControl.Opening

**Opening**

> Called when the control's layout is opening.
>
> This is where you typically put initialization code.
>
> This example in the Opening event of a Label sets its text to "Hello":
>
> ``` xojo
> Me.Text = "Hello"
> ```

## Drawing Your Control

As for Xojo 2026r1 <span class="title-ref">iOSMobileUserControl</span> has the ability to draw itself in the Layout Editor using the same techniques that you use to draw a control in the Paint event of a Canvas control with one important difference: this event has access to the Properties and Constants of your class.

To draw a preview of your control in the Layout Editor, you must implement the DrawControlInLayoutEditor event. You may wish to implement it even if you're not using it to prevent this event from being available to the end users of your control. Most of the Xojo framework itself is not available in this event. If the code you have placed in the event can't compile or runs into a runtime issue, an amber warning icon will be drawn on your control and the errors will be displayed to the Messages pane.

<div class="important">

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Important

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Methods cannot be called in this event.

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Here's an example of how you would draw a red oval within the bounds of the control:

``` xojo
g.DrawingColor = Color.Red
g.DrawOval(0, 0, g.Width, g.Height)
```

In addition to the standard drawing controls, there are also some methods for accessing the properties and constants in your control.

### Property Methods

**BooleanProperty**(Name as String) as Boolean

> Gets the current value of a Boolean property of your control.

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**ColorProperty**(name As `String</api/data_types/string>`) As `Color</api/data_types/color>`

> Gets the current value of a Color property of your control.

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**DoubleProperty**(name As `String</api/data_types/string>`) As `Double</api/data_types/double>`

> Gets the current value of a Double property of your control.

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**IntegerProperty**(name As `String</api/data_types/string>`) As `Integer</api/data_types/integer>`

> Gets the current value of an Integer property of your control.

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**PictureProperty**(name As `String</api/data_types/string>`) As `Picture</api/graphics/picture>`

> Gets the current value of a Picture property of your control.

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**StringProperty**(name As `String</api/data_types/string>`) As `String</api/data_types/string>`

> Gets the current value of a String property of your control.

### Constant Methods

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**ConstantValue**(name As `String</api/data_types/string>`) As `String</api/data_types/string>`

> Gets the value of a constant in your control as a String.
>
> You can use the ConstantValue of a string stored in a constant, such as "kDescription".:
>
> ``` xojo
> Var s As String = ConstantValue("kDescription")
> g.DrawText(s, 25, 25)
> ```

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**PictureConstant**(name As `String</api/data_types/string>`) As `Picture</api/graphics/picture>`

> Gets the value of a constant in your control as a Picture.
>
> You can use PictureConstant with the Base64 value (without the type header) of a picture stored in a constant, such as "kIcon":
>
> ``` xojo
> Var icon As Picture = PictureConstant("kIcon")
> g.DrawPicture(icon, 0, 0)
> ```

### Color Methods

**ColorGroup.NamedColor**(name As `String</api/data_types/string>`) As `Color</api/data_types/color>`

> When running on a platform that supports named colors (only macOS at the time of this writing), this method returns the named OS.
>
> <div class="note">
>
> <div class="title">
>
> Note
>
> </div>
>
> Color names are case sensitive, so the macOS secondary label color should be "secondaryLabelColor".
>
> </div>

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**TextColor** As `Color</api/data_types/color>`

> Returns the current text color of the platform that the IDE is running on.

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**FillColor** As `Color</api/data_types/color>`

> Returns the current fill color of the platform that the IDE is running on.

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**IsDarkMode** As `Boolean</api/data_types/boolean>`

> Returns `True</api/language/true>` if the system is running in dark mode (only macOS at the time of this writing).

### Font Methods

**FontCount** As `Integer</api/data_types/integer>`

> Returns the number of fonts available on the system.

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**FontAt**(index As `Integer</api/data_types/integer>`) As `String</api/data_types/string>`

> Returns the name of the font at the specified *index*.

### Other Methods

**DebugLog**(msg As `String</api/data_types/string>`)

> Sends *msg* to the Messages pane.

**Print**(msg As `String</api/data_types/string>`)

> Sends *msg* to the Messages pane.

## Compatibility

|                       |        |
|-----------------------|--------|
| **Project Types**     | Mobile |
| **Operating Systems** | iOS    |

<div class="seealso">

`MobileUIControl</api/user_interface/mobile/mobileuicontrol>` parent class

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